Mongo pull object from array inside array - node.js

Question

i have inside my mongoDB collection this document
{
"_id" : ObjectId("5b633025579fac22e74bf3be"),
"FLAGS" : [
{
"toSent" : [
{
"_id" : ObjectId("5b633025579fac22e74bf3c2"),
"phone" : "[phone]"
},
{
"_id" : ObjectId("5b633025579fac22e74bf3c1"),
"phone" : "[phone]"
},
{
"_id" : ObjectId("5b633025579fac22e74bf3c0"),
"phone" : "[phone]"
}
],
"_id" : ObjectId("5b633025579fac22e74bf3bf"),
"action" : "group_p_a"
},
{
"toSent" : [
{
"_id" : ObjectId("5b633031579fac22e74bf3c9"),
"phone" : "[phone]"
},
{
"_id" : ObjectId("5b633031579fac22e74bf3c8"),
"phone" : "[phone]"
},
{
"_id" : ObjectId("5b633031579fac22e74bf3c7"),
"phone" : "[phone]"
},
{
"_id" : ObjectId("5b633031579fac22e74bf3c6"),
"phone" : "[phone]"
}
],
"_id" : ObjectId("5b633031579fac22e74bf3c5"),
"action" : "group_p_a"
}
],
"time" : ISODate("2018-08-02T16:24:05.747+0000"),
"action_user_phone" : "[phone]",
"idGroup" : "e534379a-1580-4568-b5ec-6eaf981538d2",
"nomGroup" : "MOH FOR EVER",
"__v" : NumberInt(0)
}
TODO
I need to remove for example this element { "_id" : ObjectId("5b633025579fac22e74bf3c2"), "phone" : "[phone]"}
WHAT I DID
GroupEvents.update({}, {$pull:{FLAGS:{$elemMatch:{toSent:{phone: "[phone]"} }}}},function(err,ret){
if(err)
console.log("error"+err);
if(ret)
console.log(ret);
});
It remove all what's inside toSent event if it doesn't match.
Any help please

Answer 1

You need to use $ positional operator instead of $elemMatch here
GroupEvents.update(
{ "Flags.toSent.phone": "[phone]" },
{ "$pull": { "FLAGS.$.toSent": { "phone": "[phone]" }}},
)
If you want remove from every element of FLAGS array this you need to use $[] the all positional operator
GroupEvents.update(
{ "Flags.toSent.phone": "[phone]" },
{ "$pull": { "FLAGS.$[].toSent": { "phone": "[phone]" }}},
)